Segments and Geographic Area Analysis - Summary of Information about Disaggregated Revenue by Country (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 252,886	$ 281,563	$ 527,496	$ 513,584
Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	240,229	264,990	498,999	479,373
Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	12,657	16,573	28,497	34,211
United States [Member]
Segment Reporting Information [Line Items]
Total revenues	140,187	138,460	293,990	255,599
United States [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	134,728	129,929	281,203	234,510
United States [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	5,459	8,531	12,787	21,089
United Kingdom [Member]
Segment Reporting Information [Line Items]
Total revenues	36,368	64,433	59,909	83,195
United Kingdom [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	34,535	59,841	52,434	77,543
United Kingdom [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	1,833	4,592	7,475	5,652
Brazil [Member]
Segment Reporting Information [Line Items]
Total revenues	29,835	21,068	49,958	41,728
Brazil [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	27,712	21,068	49,958	41,728
Brazil [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	2,123	0	0	0
Senegal [Member]
Segment Reporting Information [Line Items]
Total revenues	23,388	56,391	63,981	111,703
Senegal [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	23,388	53,864	60,332	105,995
Senegal [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	0	2,527	3,649	5,708
Australia [Member]
Segment Reporting Information [Line Items]
Total revenues	23,108	1,211	59,658	21,359
Australia [Member] | Contract Drilling [Member]
Segment Reporting Information [Line Items]
Total revenues	19,866	288	55,072	19,597
Australia [Member] | Reimbursable Expenses [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 3,242	$ 923	$ 4,586	$ 1,762